The issue is the RSUs are super backloaded.
Probably still worthwhile when the $200k initial grant turns out to be worth 2-3X more after 4 years.
edit: typo
Turns into a pretty big win for them. They get to keep a lot of stock from people who quit after a couple years, plus they can justify not giving you raises after year 2 because hey you are making enough already (with stock they already allocated to give you).